As all that has been suggested above, the only tool that I like is,
https://cryptocurrencyalerting.com/. The reason is they have different features of monitoring your crypto assets like Bitcoin and Ethereum. The price, coin listing, Blockchain metric alerts, and the most important that OP wants is a wallet watch, it will notify you when upon transaction confirmed. SMS alert if you are offline or away from the internet is the best choice and also, there is a free trial option of some service provider (and some did not) and after that, there is a charge.
I think mots of them need to register, I'm looking for an easy registration but usually, it is an email address and SMS phone verification.
I didn't try this but in addition to the suggestion above here is mine.
DYOR.